fix: standardize role case handling in permission logic

Co-authored-by: aider (openai/DeepSeek-V3.2-Thinking) <aider@aider.chat>

inventory-backend/app/api/v1/outbound.py

@@ -115,7 +115,7 @@ def create_outbound():
         return jsonify({'code': 403, 'msg': '未授权'}), 403
 
     # 超级管理员直接放行
-    if user_role != 'super_admin':
+    if user_role.upper() != 'SUPER_ADMIN':
         perm_dict = AuthService.get_user_permissions(user_role)
         perms = perm_dict.get('menus', []) + perm_dict.get('elements', [])
         if ('outbound_create:operation' not in perms) and ('outbound_selection:operation' not in perms):